Exercise cycle



FIG. 1 is a right side elevational view of an exercise cycle illustrating our new design, the side opposite being substantially a mirror image;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a rear elevational view thereof; and

FIG. 5 is a front elevational view thereof. 

The ornamental design for an exercise cycle, as shown and described. 